CN218301216U - Discharge circuit, power supply circuit and consumer - Google Patents

Abstract

The utility model relates to a discharge circuit, power supply circuit and consumer, this discharge circuit includes: the discharging resistor is connected with the filter capacitor of the load circuit in parallel and used for discharging the electric energy stored by the filter capacitor; and the discharge control circuit is connected with the input end of the alternating current power supply and used for controlling whether the discharge resistor is connected to the discharge circuit of the filter capacitor or not according to the current signal output by the alternating current power supply. The utility model provides a technical scheme inserts discharge resistance selectively through the control circuit that discharges to discharge circuit, has avoided discharge resistance power consumptive loss energy always to realized the low-power consumption of circuit and involved, satisfied consumer electrical safety standard, guaranteed the fail safe nature of electrical apparatus, user experience degree is good, the satisfaction is high.

Description

Discharge circuit, power supply circuit and consumer

Technical Field

The utility model relates to an electrical engineering technical field, concretely relates to discharge circuit, power supply circuit and consumer.

Background

Along with the improvement of living standard of people, the electric equipment in every family is more and more, and people pay more and more attention to the power consumption safety of electric equipment.

In the electrical safety requirement, a power supply supplies power at a rated voltage, if a power switch of the electric equipment is placed at an 'off' position, the electric equipment is disconnected from the power supply at the voltage peak value, and the voltage between pins of the power plug is measured at 1s after disconnection, wherein the voltage should not exceed 24V.

In the EMC test, in order to suppress the power supply noise of the unit, a filter device (e.g., a filter capacitor) is added between the power supply and the load. However, when the filter capacitor is large, it is difficult to meet the electrical safety requirement that the power failure of the electric equipment is rapidly reduced to 24V, so a discharge resistor of several tens to several hundreds of K is usually added to the power circuit of the electric equipment, but the discharge resistor works in an operating state for a long time, which causes energy loss, and does not meet the low power consumption design.

SUMMERY OF THE UTILITY MODEL

For overcoming the problem that exists in the correlation technique to a certain extent at least, the utility model provides a discharge circuit, power supply circuit and consumer to solve among the prior art consumer's discharge resistance long-term work under the running state, can cause energy loss, can not satisfy the problem of low-power consumption design.

According to the utility model discloses a first aspect provides a discharge circuit, includes:

the discharging resistor is connected with the filter capacitor of the load circuit in parallel and used for discharging the electric energy stored by the filter capacitor;

and the discharge control circuit is connected with the input end of the alternating current power supply and used for controlling whether the discharge resistor is connected to the discharge circuit of the filter capacitor or not according to the current signal output by the alternating current power supply.

Preferably, the discharge circuit further includes:

a switching element connected in series with the discharge resistor;

and the discharge control circuit controls whether the discharge resistor is connected to the discharge circuit of the filter capacitor or not through the switch element.

Preferably, the discharge control circuit includes:

the current-voltage conversion element is connected in series with the input end of the alternating current power supply and is used for converting a current signal output by the alternating current power supply into a voltage signal;

and the input end of the comparator is connected with the current-voltage conversion element, the output end of the comparator is connected with the control end of the switch element, and the comparator is used for controlling the on-off of the switch element according to the voltage signal so as to control whether the discharge resistor is connected to the discharge circuit of the filter capacitor.

Preferably, the comparator includes:

a first comparator, wherein the positive phase input end of the first comparator is connected with the current-voltage conversion element, and the negative phase input end of the first comparator is connected with a first reference voltage source; and/or the presence of a gas in the atmosphere,

the inverting input end of the second comparator is connected with the current-voltage conversion element, and the non-inverting input end of the second comparator is connected with a second reference voltage source;

the output end of the first comparator and/or the second comparator is connected with the control end of the switch element.

Preferably, the first reference voltage source outputs a first normally high level signal; and/or the presence of a gas in the gas,

the second reference voltage source outputs a first normally-low level signal;

the amplitude of the first normally high level signal is less than or equal to the maximum peak value of the output voltage signal of the alternating current power supply; and/or the presence of a gas in the atmosphere,

the amplitude of the first normally-low level signal is larger than or equal to the minimum peak value of the output voltage signal of the alternating current power supply.

Preferably, the comparator controls the on/off of the switch element according to the voltage signal, and includes:

when the voltage signal is greater than or equal to a first normal high level signal, outputting a switch control signal, wherein the switch control signal controls the switch element to be closed;

when the voltage signal is greater than 0 and less than a first normal high level signal, stopping outputting the switch control signal, and opening the switch element;

and/or the presence of a gas in the atmosphere,

when the voltage signal is less than or equal to a first normal low level signal, outputting a switch control signal, wherein the switch control signal controls the switch element to be closed;

when the voltage signal is smaller than 0 and larger than a first constant low level signal, the switch control signal is stopped being output, and the switch element is opened.

Preferably, a rectification output circuit is connected in parallel with two ends of the filter capacitor;

the power supply end of the comparator is connected with the rectification output circuit;

the rectification output circuit is used for supplying power to a load and the comparator.

Preferably, the first and second electrodes are formed of a metal,

the current-voltage conversion element is a current transformer; and/or the presence of a gas in the gas,

the switching element is a transistor.

According to the utility model discloses in the second aspect of the embodiment, provide a power supply circuit of consumer, include:

the discharge circuit described above.

According to the utility model discloses a third aspect provides an electric equipment, includes:

the power supply circuit described above.

Preferably, the power consuming device comprises: domestic electric equipment and industrial electric equipment.

The embodiment of the utility model provides a technical scheme can include following beneficial effect:

the discharge control circuit selectively accesses the discharge resistor into the discharge circuit, so that the discharge resistor is prevented from consuming power and losing energy all the time, low power consumption of the circuit is realized, the electrical safety standard of electric equipment is met, the safety and reliability of an electric appliance are ensured, and the user experience degree is good and the satisfaction degree is high.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

FIG. 1 is a functional block diagram of a discharge circuit shown in accordance with an exemplary embodiment;

FIG. 2 is a graph of voltage waveforms of an AC power output shown in accordance with an exemplary embodiment.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.

Example one

Fig. 1 is a functional block diagram illustrating a discharge circuit according to an exemplary embodiment, the discharge circuit including, as shown in fig. 1:

the discharging resistor 2 is connected in parallel with the filter capacitor 1 of the load circuit and used for discharging the electric energy stored in the filter capacitor 1;

and the discharge control circuit is connected with an AC input end of an AC power supply and is used for controlling whether the discharge resistor 2 is connected to the discharge circuit of the filter capacitor 1 or not according to a current signal output by the AC power supply.

It should be noted that the technical solution provided in this embodiment is applied to a power supply circuit of an electric device (that is, the load circuit is a power supply circuit), and is used for discharging the electric energy stored in the filter capacitor 1 of the power supply circuit after the electric device is powered off.

In addition, the power consumption device includes: domestic power consumption equipment and industrial power consumption equipment.

The household electric device includes but is not limited to: air conditioners, refrigerators, washing machines, air purifiers, electric rice cookers, microwave ovens, induction cookers, and the like. The industrial electric device includes but is not limited to: warehouse robots, central air conditioners, and the like.

Preferably, the discharge circuit further includes:

a switching element 3 connected in series to the discharge resistor 2;

the discharge control circuit controls whether the discharge resistor 2 is connected to the discharge circuit of the filter capacitor 1 through the switch element 3.

In a specific practice, the switching element 3 may be selected from a triode, a relay, an MOS transistor, and the like, specifically according to a user's requirement. For example, in the embodiment shown in fig. 2, a transistor is used as the switching element 3.

In a specific practice, the discharge control circuit may have a plurality of implementations, and fig. one of the implementations is shown, referring to fig. 1, the discharge control circuit includes:

the current-voltage conversion element 4 is connected in series with the input end of the alternating current power supply AC and is used for converting a current signal output by the alternating current power supply AC into a voltage signal;

and the input end of the comparator 5 is connected with the current-voltage conversion element 4, the output end of the comparator is connected with the control end of the switch element 3, and the comparator is used for controlling the on-off of the switch element 3 according to the voltage signal so as to control whether the discharge resistor 2 is connected to the discharge circuit of the filter capacitor 1.

In specific practice, the current-voltage conversion element 4 may employ a current transformer;

after the current transformer converts the current signal output by the alternating current power supply into a voltage signal, the voltage signal is as shown in fig. 2, referring to fig. 2, the alternating current output by the alternating current power supply AC is a sine waveform, and the voltage amplitude changes from a trough to a peak of-310V- + 310V.

When the voltage interval is between-V1 and + V1 (corresponding to intervals (2) and (3) of fig. 2), in specific practice, the value of V1 is selected according to experimental results, for example, V1 is selected to be 220V, because the current voltage value is lower, after the power failure of the electric equipment, the residual voltage U = the current voltage value- Δ U in 1S (Δ U is the natural power failure voltage of the circuit in 1S, and Δ U is not less than 0), multiple experiments show that the residual voltage U = the current voltage value- Δ U in 1S can fall below 24V, the discharge resistor can not be connected, and the voltage peak value after the power failure of 1S meets the electrical safety.

When the voltage interval is between-V1 and-330V (corresponding to the interval (4) in fig. 2) and when the voltage interval is between + V1 and +310V (corresponding to the interval (1) in fig. 2), multiple experiments show that the residual voltage U = the current voltage value- Δ U within 1S cannot drop below 24V, and the electrical safety standard cannot be met, so that the discharge resistor needs to be connected.

Since the interval in which the discharge resistor needs to be connected includes two intervals, corresponding to the interval (4) and the interval (1) in fig. 2, in a specific practice, the comparator 5 includes:

a first comparator 51 having a non-inverting input terminal connected to the current-voltage conversion element 4 and an inverting input terminal connected to a first reference voltage source (not shown in the drawing); and/or the presence of a gas in the atmosphere,

a second comparator 52 having an inverting input terminal connected to the current-voltage conversion element 4 and a non-inverting input terminal connected to a second reference voltage source (not shown in the drawings);

the output of the first comparator 51 and/or the second comparator 52 is connected to the control terminal of the switching element 3.

Preferably, the first reference voltage source outputs a first normally high level signal; and/or the presence of a gas in the gas,

the second reference voltage source outputs a first normally low level signal.

It should be noted that the first reference voltage source is not shown in fig. 1, and Ref1 in fig. 1 represents a first normally-high level signal output by the first reference voltage source, as a reference voltage signal of the first comparator 51;

the second reference voltage source is not shown in fig. 1, and Ref2 in fig. 1 represents a first normally-low level signal output by the second reference voltage source as the reference voltage signal of the second comparator 52.

The amplitude of the first normally high level signal is less than or equal to the maximum peak value of the output voltage signal of the alternating current power supply; and/or the presence of a gas in the atmosphere,

the amplitude of the first normally-low level signal is larger than or equal to the minimum peak value of the output voltage signal of the alternating current power supply.

For example, if the ac power supply outputs an ac signal having an amplitude in the range [ -310V, +310V ], the amplitude of the first normally high signal is less than +310V; and/or the presence of a gas in the gas,

the first normally-low level signal has an amplitude greater than-310V.

In the technical solution provided in this embodiment, it is limited that the amplitude of the first normally high level signal is less than or equal to the maximum peak value of the output voltage signal of the ac power supply; and/or the amplitude of the first normally-low level signal is greater than or equal to the minimum peak value of the output voltage signal of the alternating current power supply, because the electric energy stored by the filter capacitor of the load circuit cannot exceed the energy output by the alternating current power supply, the voltage amplitude interval of the discharging performed by the access discharging resistor cannot exceed the maximum minimum peak value interval of the output voltage signal of the alternating current power supply.

Taking fig. 1 and fig. 2 as an example, it can be understood that the first comparator 51 and the second comparator 52 are respectively used for controlling the filter capacitor 1 to be discharged when the voltage signal output by the AC power source AC is in the interval (1) and the interval (4). In a specific practice, the models of the first comparator 51 and the second comparator 52 may be the same or different, and are specifically set according to the user's needs.

The amplitude of the first normally high level signal and the amplitude of the second normally low level signal may be the same or different, and are specifically set according to experimental results, as long as the experimental results show that after the power-off of the electric equipment, the voltage between the pins of the power plug in 1S can be reduced to below 24V, for example, according to the experimental results, the amplitude of the first normally high level signal may be selected to be +220V, and the amplitude of the second normally low level signal may be selected to be-220V. For another example, according to the experimental result, the amplitude of the first normally high level signal may be selected to be +260V, the amplitude of the second normally low level signal may be selected to be-210V, and the like.

Therefore, the comparator 5 controls the on/off of the switching element 3 according to the voltage signal, and includes:

when the voltage signal is greater than or equal to a first normally high level signal (e.g., ref1 in fig. 1), outputting a switch control signal (e.g., a high level signal), which controls the switching element (e.g., the transistor Q1 in fig. 1) to be closed (corresponding to the interval (1) in fig. 2);

when the voltage signal is greater than 0 and less than a first normally high level signal (e.g., ref1 in fig. 1), stopping outputting the switch control signal (e.g., outputting a low level signal), and the switch element is opened (corresponding to interval (2) in fig. 2);

and/or the presence of a gas in the gas,

when the voltage signal is less than or equal to a first normally-low level signal (e.g., ref2 in fig. 1), outputting a switch control signal (e.g., a high level signal), which controls the switch element to close (corresponding to interval (4) in fig. 2);

when the voltage signal is less than 0 and greater than the first normally low level signal (e.g., ref2 in fig. 1), the output of the switch control signal is stopped (e.g., a low level signal is output), and the switching element is opened (corresponding to interval (3) of fig. 2).

In fig. 1, the filter capacitor 1, the discharge resistor 2, the switching element 3, the current-voltage conversion element 4, and the comparator 5 all belong to a part of the electric equipment. The present embodiment is improved by a power supply circuit of a power consumption device (the power supply circuit also belongs to a part of the power consumption device), and the power supply circuit comprises the above-mentioned filter capacitor 1, a discharge resistor 2, a switch element 3, a current-voltage conversion element 4, and a comparator 5.

The designation "AC" in fig. 1 refers to the AC plug of the consumer.

First, when the powered device is disconnected from the AC power source, i.e., the "AC" input in fig. 1 is unplugged from the AC power source, the input of the entire powered device is unpowered, i.e., the "AC" input in fig. 1 is unpowered. At this time, the ac power source and the filter capacitor 1 cannot form a loop, because the ac power source is not connected to the electric equipment at this time.

Next, when the electric equipment is disconnected from the ac power supply, the switching element 3 is closed, and the filter capacitor 1 and the discharge resistor 2 form a discharge circuit, because the filter capacitor 1 stores the residual electric quantity, and the discharge resistor 2 discharges the residual electric quantity.

When the electric equipment is disconnected from the AC power source, the input terminal labeled "AC" in fig. 1 has no AC power input, but the filter capacitor 1 is discharging, and the current-voltage conversion element 4 is able to detect the electric signal and operates normally.

If the electric device is not disconnected from the AC power source AC, it can be seen from fig. 2 and the above description that the discharge resistor 2 needs to be connected to the circuit when the AC power is in the section (4) and the section (1). This is in order to guarantee that when the consumer cuts off the power supply in interval (4) and interval (1), residual voltage U = current voltage value- < delta > U can fall below 24V in 1S, satisfies the electrical safety standard, and then solves the technical problem that this application will solve: the problem of among the prior art consumer discharge resistance long-term work under the running state, can cause energy loss, can not satisfy the low-power consumption design is solved.

Preferably, both ends of the filter capacitor 1 are connected in parallel with a rectification output circuit;

the power supply end of the comparator 5 is connected with the rectification output circuit;

the rectifying output circuit is used for supplying power to a load and the comparator 5.

It is understood that in practical applications, the comparator 5 may be powered by an external power source, or may be powered by a power source of an original circuit of the electric device. According to the technical scheme provided by the embodiment, the weak current output by the rectification output circuit of the original circuit provides the working voltage for the comparator 5, so that the circuit design is simplified, the wiring is reduced, the integration level of the circuit is improved, the circuit architecture is more simplified, the user experience is good, and the satisfaction is high.

It can be understood that, according to the technical scheme provided by this embodiment, the discharging resistor 2 and the switching element 3 are connected in series, and the switching element 3 is controlled to be turned on or off according to the current signal output by the ac power supply, so that the discharging resistor 2 is selectively connected into the discharging circuit, and the energy loss caused by the discharging resistor is avoided, so that the low power consumption of the circuit is realized, the electrical safety standard of the electric equipment is met, the safety and reliability of the electric appliance are ensured, and the user experience degree is good and the satisfaction degree is high.

Example two

A power supply circuit for a powered device is shown according to an exemplary embodiment, comprising:

the discharge circuit described above.

It should be noted that the technical solution provided in this embodiment is applicable to electric devices.

It should be noted that the electric device includes: domestic electric equipment and industrial electric equipment.

The household electric devices include but are not limited to: air conditioners, refrigerators, washing machines, air purifiers, electric rice cookers, microwave ovens, induction cookers, and the like. The industrial electrical equipment includes but is not limited to: warehouse robots, central air conditioners, and the like.

It can be understood that, in the technical scheme provided in this embodiment, because the power supply circuit includes the discharge circuit, the discharge circuit discharges the electric energy stored in the filter capacitor of the power supply circuit only when the residual voltage of the power supply circuit in the power-down 1S cannot drop below 24V and the electrical safety standard cannot be met, so that the energy loss caused by the discharge resistor is avoided, and thus, the low power consumption of the circuit is realized, the electrical safety standard of the electrical equipment is met, the safety and reliability of the electrical equipment are ensured, and the user experience and the satisfaction are high.

EXAMPLE III

An electrical device shown according to an exemplary embodiment includes:

the power supply circuit described above.

Preferably, the power consuming device comprises: domestic electric equipment and industrial electric equipment.

It should be noted that the household electrical equipment includes, but is not limited to: air conditioner, refrigerator, washing machine, air purifier, electric cooker, microwave oven, electromagnetic oven, etc. The industrial electrical equipment includes but is not limited to: warehouse robots, central air conditioners, and the like.

It can be understood that, in the technical scheme provided in this embodiment, because the electrical equipment includes the power supply circuit, the power supply circuit can be connected to the discharge resistor only when the residual voltage in the power failure 1S cannot drop below 24V and the electrical safety standard cannot be met, so that energy loss caused by the discharge resistor due to power consumption all the time is avoided, thereby realizing low power consumption of the circuit, meeting the electrical safety standard of the electrical equipment, ensuring the safety and reliability of the electrical equipment, and having good user experience and high satisfaction.

It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.

It should be noted that, in the description of the present invention, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means at least two unless otherwise specified.

Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps in the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present invention.

It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.

It will be understood by those skilled in the art that all or part of the steps carried out in the method of implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and the program, when executed, includes one or a combination of the steps of the method embodiments.

In addition, each functional unit in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.

The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims (10)

1. A discharge circuit, comprising:

the discharging resistor is connected with the filter capacitor of the load circuit in parallel and used for discharging the electric energy stored by the filter capacitor;

and the discharge control circuit is connected with the input end of the alternating current power supply and used for controlling whether the discharge resistor is connected to the discharge circuit of the filter capacitor or not according to the current signal output by the alternating current power supply.

2. The discharge circuit of claim 1, further comprising:

a switching element connected in series with the discharge resistor;

and the discharge control circuit controls whether the discharge resistor is connected to the discharge circuit of the filter capacitor or not through the switch element.

3. The discharge circuit of claim 2, wherein the discharge control circuit comprises:

the current-voltage conversion element is connected in series with the input end of the alternating current power supply and is used for converting a current signal output by the alternating current power supply into a voltage signal;

and the input end of the comparator is connected with the current-voltage conversion element, the output end of the comparator is connected with the control end of the switch element, and the comparator is used for controlling the on-off of the switch element according to the voltage signal so as to control whether the discharge resistor is connected to the discharge circuit of the filter capacitor.

4. The discharge circuit of claim 3, wherein the comparator comprises:

a first comparator, wherein the positive phase input end of the first comparator is connected with the current-voltage conversion element, and the negative phase input end of the first comparator is connected with a first reference voltage source; and/or the presence of a gas in the gas,

the inverting input end of the second comparator is connected with the current-voltage conversion element, and the non-inverting input end of the second comparator is connected with a second reference voltage source;

the output end of the first comparator and/or the second comparator is connected with the control end of the switch element.

5. The discharge circuit of claim 4,

the first reference voltage source outputs a first normally high level signal; and/or the presence of a gas in the gas,

the second reference voltage source outputs a first normally-low level signal;

the amplitude of the first normally high level signal is less than or equal to the maximum peak value of the output voltage signal of the alternating current power supply; and/or the presence of a gas in the gas,

the amplitude of the first normally-low level signal is larger than or equal to the minimum peak value of the output voltage signal of the alternating current power supply.

6. The discharge circuit of claim 5, wherein the comparator controls the on/off of the switching element according to the voltage signal, and comprises:

when the voltage signal is greater than or equal to a first normal high level signal, outputting a switch control signal, wherein the switch control signal controls the switch element to be closed;

when the voltage signal is greater than 0 and less than a first constant high level signal, stopping outputting the switch control signal, and opening the switch element;

and/or the presence of a gas in the gas,

when the voltage signal is less than or equal to a first normal low level signal, outputting a switch control signal, wherein the switch control signal controls the switch element to be closed;

when the voltage signal is smaller than 0 and larger than a first constant low level signal, the switch control signal is stopped being output, and the switch element is opened.

7. The discharge circuit of claim 3,

a rectification output circuit is connected in parallel at two ends of the filter capacitor;

the power supply end of the comparator is connected with the rectification output circuit;

the rectification output circuit is used for supplying power to a load and the comparator.

8. The discharge circuit according to any one of claims 3 to 7,

the current-voltage conversion element is a current transformer; and/or the presence of a gas in the gas,

the switching element is a transistor.

9. A power supply circuit for a powered device, comprising:

the discharge circuit according to any one of claims 1 to 8.

10. An electrical device, comprising:

the power supply circuit of claim 9;

the electric device includes: domestic electric equipment and industrial electric equipment.

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